I have any number of rulers where the lines and numbers have worn off. Some have nicks or like yours are no longer straight lines. Yes, this is frustrating. I have replaced many, and cutting mats too, over the years. The last one replace was my 24" Omnigrid ruler and bought at Quilter's Select ruler this time around. I was set in my way and did not really want to change until I compared the differences in the 2 rulers for accuracy and control. This time around the Quilter's Select won out. I have also use Fiskar rulers and they wear out the quickest, IMHO. There is no guarantee that the QS ruler will last any longer but it is offering so much better control I am finding it worth the extra $$ I paid for it.